666599559356 has 24 divisors (see below), whose sum is σ = 1200750329856. Its totient is φ = 323639714160.

The previous prime is 666599559341. The next prime is 666599559371. The reversal of 666599559356 is 653955995666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666599559341) and next prime (666599559371).

It is a super-2 number, since 2×666599559356² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13935740 + ... + 13983491.

It is an arithmetic number, because the mean of its divisors is an integer number (50031263744).

Almost surely, 2^666599559356 is an apocalyptic number.

It is an amenable number.

666599559356 is a deficient number, since it is larger than the sum of its proper divisors (534150770500).

666599559356 is a wasteful number, since it uses less digits than its factorization.

666599559356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27919409 (or 27919407 counting only the distinct ones).

The product of its digits is 1771470000, while the sum is 74.

The spelling of 666599559356 in words is "six hundred sixty-six billion, five hundred ninety-nine million, five hundred fifty-nine thousand, three hundred fifty-six".